Overdrive off button flashes and speedo not working - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 04-09-2009, 07:30 AM Thread Starter
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Overdrive off button flashes and speedo not working

It is not happening all the time but...

My overdrive button flashes. When that is happening, I notice that my speedometer is not working. I pull over shut the truck off, restart and everything works fine.

Any ideas?

PS. my ABS light has been coming on randomly and I believe that my rear sensor is going .

I don't think the two are related but I wanted to mention it.


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post #2 of 7 Old 04-09-2009, 07:37 AM
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The od light flashing... the trans has set a code. The speed sensor on the rear end is bad. 99% sure,When the sensor is replaced, should clear up all problems, od light flashing/spedo not working /and the abs light.

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post #3 of 7 Old 04-09-2009, 07:46 AM
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just go to some tranny shop for a free test to pull codes

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post #4 of 7 Old 04-09-2009, 08:04 AM Thread Starter
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Thanks.
Any other ideas/advice/opinions is always appreciated.


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"Late" 99 F250
Crew Cab, Short Box
Straight piped (no muffler but rest of exhaust stock), 35" BFG A/T
DIY NAPA 6637 Intake
Zoodad mod (my version of it)
Leveling kit
4" exhaust
TW Chip
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post #5 of 7 Old 04-09-2009, 08:04 AM
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yep... speed sensor. There are also two in the front. Each ABS sensor in the hubs is a speed sensor. But probably the one in the rear...

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..


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You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #6 of 7 Old 04-09-2009, 08:59 AM Thread Starter
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so is the speed sensor and the abs sensor two different things?

I imagine they are. I was planning on getting an ABS sensor for the rear from Advanced Auto (on $17). Should I still replace that or should I change the speed sensor first to see if it fixes everything. OR is the ABS and speed sensor all in one unit??


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"Late" 99 F250
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DIY NAPA 6637 Intake
Zoodad mod (my version of it)
Leveling kit
4" exhaust
TW Chip
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post #7 of 7 Old 04-09-2009, 09:08 AM
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The abs sensor in each front hub is a speed sensor. The computer takes input from each hub and the rear diff. then I think there is another sensor or two in the tranny.

You can pull the codes to find which one is bad. If someone nearby has AE software or a good code reader they can tell which one is bad...

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..


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Originally Posted by Mannysouza View Post
You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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